package com.example.image.glide

import android.content.Context
import android.os.Environment
import com.bumptech.glide.Glide
import com.bumptech.glide.GlideBuilder
import com.bumptech.glide.Registry
import com.bumptech.glide.integration.okhttp3.OkHttpUrlLoader
import com.bumptech.glide.load.engine.cache.InternalCacheDiskCacheFactory
import com.bumptech.glide.load.engine.cache.LruResourceCache
import com.bumptech.glide.load.engine.cache.MemorySizeCalculator
import com.bumptech.glide.load.model.GlideUrl
import com.bumptech.glide.module.AppGlideModule
import okhttp3.Cache
import okhttp3.OkHttpClient
import java.io.File
import java.io.InputStream

/**
 * 自定义Glide内存和磁盘缓存大小
 */
class CustomGlideModel :AppGlideModule(){
    /**
     * 自定义Glide内存和磁盘缓存大小
     */
    override fun applyOptions(context: Context, builder: GlideBuilder) {
        //计算使用多大内存空间
        val glideMemorySize=MemorySizeCalculator.Builder(context).build().memoryCacheSize /6L
        //设置内存大小(默认为当前App内存的1/8)
        builder.setMemoryCache(LruResourceCache(glideMemorySize))
        //设置磁盘大小(默认250M)
        builder.setDiskCache(InternalCacheDiskCacheFactory(context,"glide_disk_cache",300*1024*1024))
    }
    /**
     * 自定义网络缓存大小
     * Glide网络采用OKHttp实现
     */
    override fun registerComponents(context: Context, glide: Glide, registry: Registry) {
        try {
            val builder = OkHttpClient.Builder()
            //先考虑外部SD卡,如果没有再考虑内存SD卡
            val externalDir = Environment.getExternalStorageDirectory()
            var cacheDir = if (externalDir.exists()) {
                "${externalDir.absolutePath}/glideCache"//外置SD卡
            } else {
                "${context.externalCacheDir?.absolutePath}/glideCache"//内置SD卡
            }
            val cacheFile = File(cacheDir)
            //计算一下缓存大小
            var cacheSize = 50 * 1024 * 1024L
            if (externalDir.exists() && externalDir.totalSpace > 0L) {
                cacheSize = externalDir.totalSpace / 8L
            } else {
                cacheSize = context.externalCacheDir?.totalSpace?.div(8L) ?: 10 * 1024 * 1024L
            }

            val networkCache = Cache(cacheFile, cacheSize)
            //设置网络缓存目录
            builder.cache(networkCache)
            val newOkHttpClient = builder.build()
            //替换OkHttp客户端
            registry.replace(
                GlideUrl::class.java,
                InputStream::class.java,
                OkHttpUrlLoader.Factory(newOkHttpClient)
            )

        } catch (e: Exception) {
            e.printStackTrace()
        }
    }
}